linux-kernel - Re: [RFC PATCH 2/5] tracing/events: nicer print format for parsing

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Message-ID: <20090609200159.GA30713@Krystal>
Date:	Tue, 9 Jun 2009 16:01:59 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Mel Gorman <mel@....ul.ie>,
	Christoph Hellwig <hch@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Peter Zijlstra <peterz@...radead.org>,
	Theodore Tso <tytso@....edu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jason Baron <jbaron@...hat.com>,
	Jiaying Zhang <jiayingz@...gle.com>
Subject: Re: [RFC PATCH 2/5] tracing/events: nicer print format for parsing

* Steven Rostedt (rostedt@...dmis.org) wrote:

> Again, anyone have any better ideas?
> 
> -- Steve
> 

Hi Steven,

sorry I don't have much time to look into this. My ph.d. thesis is due
for july 5th..

I just wanted to let you now that I wrote a very simple XML parser in
the early days of LTTng. I dumped it in favor of the trace_mark() format
strings, but it really gave much more flexibility to describe events,
including nested structures, unions... etc.

It's written in C with almost no external dependency. The goal was to
make it so it could be acceptable in the kernel tree. I think you might
want to have a quick look at it. It generated the probe callbacks which
were, at the time, inlines. Since then I realised that inlining the
tracer code in the kernel call site pollutes the i-cache, so it's not
the way I would deal with code generation today, but those are minor
details.

It would need a cleanup. I did not write the original version of this
code, but rather kicked it until it worked as I wanted it. It worked
with the old LTTng versions:

http://www.lttng.org/files/packages/genevent-0.35.tar.gz

The package contains sample XML files.

Good luck,

Mathieu

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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